<!DOCTYPE html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
    .content{
      width: 100%;
      display:flex;
    }
    .left{
      flex:1;
      background:yellow;
    }
    .right{
      width:200px;
      height: 200px;
      background:red;
    }
  </style>
</head>
<body>
<div class="content">
  <div class="left"><div>
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  </div></div>
  <div class="right">ririghrighright....</div>
</div>
</body>
</html>
